Questions from Modern Physics

Q: A parallel-plate capacitor has capacitance C = 12.5

A parallel-plate capacitor has capacitance C = 12.5 pF when the volume between the plates is filled with air. The plates are circular, with radius 3.00 cm. The capacitor is connected to a battery, and...

Q: A parallel-plate capacitor has capacitance C0 = 8.00

A parallel-plate capacitor has capacitance C0 = 8.00 pF when there is air between the plates. The separation between the plates is 1.50 mm. (a). What is the maximum magnitude of charge Q that can be...

Q: A parallel-plate capacitor has plates with area 0.0225

A parallel-plate capacitor has plates with area 0.0225 m2 separated by 1.00 mm of Teflon. (a). Calculate the charge on the plates when they are charged to a potential difference of 12.0 V. (b). Use...

Q: A 5.00-A current runs through a 12-

A 5.00-A current runs through a 12-gauge copper wire (diameter 2.05 mm) and through a light bulb. Copper has 8.5 × 1028 free electrons per cubic meter. (a). How many electrons pass through the light...

Q: An 18-gauge copper wire (diameter 1.02 mm

An 18-gauge copper wire (diameter 1.02 mm) carries a current with a current density of 3.20 × 106 A/m2. The density of free electrons for copper is 8.5 × 1028 electrons per cubic meter. Calculate (a)...

Q: Copper has 8.5 × 1028 free electrons per cubic meter

Copper has 8.5 × 1028 free electrons per cubic meter. A 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 A of current. (a). How much time does it take for an electron t...

Q: You want to produce three 1.00-mm-diameter

You want to produce three 1.00-mm-diameter cylindrical wires, each with a resistance of 1.00 Ω at room temperature. One wire is gold, one is copper, and one is aluminum. Refer to Table 25....

Q: If quantum mechanics replaces the language of Newtonian mechanics, why don’t

If quantum mechanics replaces the language of Newtonian mechanics, why don’t we have to use wave functions to describe the motion of macroscopic bodies such as baseballs and cars?

Q: A particle in a box is in the ground level. What

A particle in a box is in the ground level. What is the probability of finding the particle in the right half of the box? (Refer to Fig. 40.12, but don’t evaluate an integral.) Is the answer the same...

Q: Assume that the universe has an edge. Placing yourself at that

Assume that the universe has an edge. Placing yourself at that edge in a thought experiment, explain why this assumption violates the cosmological principle.